Motor

ABSTRACT

A sliding hole is formed so that a screw portion can pass therethrough. Also, a seal member is provided at a portion, through which the screw portion placed in the sliding hole can pass and in which a sliding portion does not slide.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a Divisional of U.S. application Ser. No. 10/893,317filed Jul. 19, 2004; the above-noted application incorporated herein byreference in its entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention generally relates to a current-driven motor, andmore particularly to a motor for performing a rotational-to-linearmotion conversion on rotation of a rotor provided in a motor to cause anoutput shaft of the motor to perform a linear motion.

2. Description of the Related Art

A related motor is configured so that a portion, through a screw portionof a sliding shaft is passed, is provided in a sliding hole of aregulating portion, which regulates rotation of an output shaft and thatslides the output shaft, and opened to the outside of the motor.

Also, a stopper provided in a part of a resin rotor is made to abutagainst the output shaft so as to stop an axial movement of the outputshaft.

Also, a spring holder for supporting a spring, which pushes the outputshaft in the direction of a rotor, has a necessary minimum size forsupporting the spring in such a way as not to hinder the movement of theoutput shaft.

Moreover, a coil wire is supported by caulking a part of each ofterminals and also fixed to the terminals by being welded thereto.

[Patent Document 1]

JP-A-7-55012

[Patent Document 2]

JP-A-7-274472

[Patent Document 3]

JP-A-6-141502

Because the related motor is configured so that a portion, through ascrew portion of a sliding shaft is passed, is provided in a slidinghole of a regulating portion, which regulates rotation of an outputshaft and that slides the output shaft, and opened to the outside of themotor, foreign substances, moisture, gas and so on enter the inside ofthe motor and bring about performance deterioration thereof.

Also, because the stopper provided in a part of a resin rotor is made toabut against the output shaft so as to stop an axial movement of theoutput shaft, the rotor is broken by an impact force exerted thereon.Such a broken part becomes a foreign matter and brings about performancedeterioration of the motor.

Also, because the spring holder for supporting a spring, which pushesthe output shaft in the direction of a rotor, has a necessary minimumsize for supporting the spring in such a way as not to hinder themovement of the output shaft, foreign substances, moisture, gas and soon enter the inside of the motor through surrounding areas of the springholder and bring about performance deterioration thereof.

Moreover, although the coil wire is supported by caulking a part of eachof terminals and also fixed to the terminals by being welded thereto,when the coil wire is hung on the terminals, hung parts thereof areliable to be flawed. Thus, the coil wire becomes easy to be broken.Also, when plural coil wires are caulked together to the terminal, theareas of parts of the coil wires, which are brought into contact withthe terminal, become small. Consequently, defects of welding are caused.

SUMMARY OF THE INVENTION

The invention is accomplished to solve the aforementioned problems.Accordingly, an object of the invention is to obtain a motor enabled toprevent foreign substances, moisture, gas and so on from entering theinside of the motor even when a portion, through a screw portion of asliding shaft is passed, is provided in a sliding hole of a regulatingportion, which regulates rotation of an output shaft and that slides theoutput shaft.

Another object of the invention is to provide a motor enabled to obtaina rotor from being broken by an impact force exerted thereon when anoutput shaft abuts against the rotor.

Another object of the invention is to obtain a motor enabled to preventforeign substances, moisture, gas and so on from going thereinto throughsurrounding areas of a spring holder thereof.

Another object of the invention is to obtain a motor enabled to preventflaws from being caused in a part of a coil wire when the part of thecoil wire is hung on a terminal, and also enabled to bring plural coilwires into sufficient contact with a terminal when the plural coil wiresare caulked together to the terminal.

According to an aspect of the invention, there is provided a motor thatcomprises a stator provided with a coil to be supplied with electriccurrent, a rotor adapted to rotate in the stator and provided with amagnet, an output shaft having a screw portion to be screwed into athreaded hole provided in the rotor, a regulating portion for axiallymoving the output shaft by regulating rotation of the output shaft andfor sliding and holding the output shaft, and a sliding portion,provided in the output shaft and adapted to slide in a sliding holeprovided in the regulating portion. The sliding hole is formed in such away as to permit a screw portion to pass therethrough. A seal member isprovided at a portion, through which the screw portion placed in thesliding hole is permitted to pass and in which the sliding portion doesnot slide.

According to another aspect of the invention, there is provided a motorthat comprises a stator provided with a coil to be supplied withelectric current, a rotor adapted to rotate in the stator and providedwith a magnet, an output shaft having a screw portion to be screwed intoa threaded hole provided in the rotor, a regulating portion for axiallymoving the output shaft by regulating rotation of the output shaft andfor sliding and holding the output shaft, and a sliding portion,provided in the output shaft and adapted to slide in a sliding holeprovided in the regulating portion. The sliding portion is larger incross-section than the screw portion.

According to another aspect of the invention, there is provided a motorthat comprises a stator provided with a coil to be supplied withelectric current, a rotor adapted to rotate in the stator and providedwith a magnet, an output shaft having a screw portion to be screwed intoa threaded hole provided in the rotor, a regulating portion for axiallymoving the output shaft by regulating rotation of the output shaft andfor sliding and holding the output shaft, a sliding portion, provided inthe output shaft and adapted to slide in a sliding hole provided in theregulating portion, a pushing member for pushing the output shaft in adirection of the rotor, a plate, fixed to the output shaft, forsupporting the pushing member, and an accommodating member in which theplate and the output shaft are displaceably accommodated. An extensionportion extended from a support portion of the plate, which supports thepushing member, toward a direction of an inner surface of theaccommodating member is provided in the plate.

According to another aspect of the invention, there is provided a motorthat comprises a stator provided with a coil to be supplied withelectric current, a resin rotor adapted to rotate in the stator andprovided with a magnet, an output shaft having a screw portion to bescrewed into a threaded hole provided in the rotor, a regulating portionfor axially moving the output shaft by regulating rotation of the outputshaft and for sliding and holding the output shaft, a sliding portion,provided in the output shaft and adapted to slide in a sliding holeprovided in the regulating portion, and a metallic stopper, provided inthe rotor and adapted to abut against the output shaft, for axiallyregulating the output shaft.

According to another aspect of the invention, there is provided a motorthat comprises a stator provided with a coil to be supplied withelectric current, a rotor adapted to rotate in the stator and providedwith a magnet, an output shaft having a screw portion to be screwed intoa threaded hole provided in the rotor, a regulating portion for axiallymoving the output shaft by regulating rotation of the output shaft andfor sliding and holding the output shaft, and a sliding portion,provided in the output shaft and adapted to slide in a sliding holeprovided in the regulating portion, a terminal provided in the stator. Acoil wire of a coil is fixed to the terminal. This motor also comprisesa concave hook portion provided in the terminal. The coil wire is woundaround the hook portion.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other objects and advantages of this invention will becomemore fully apparent from the following detailed description taken withthe accompanying drawings in which:

FIG. 1 is an axially sectional view illustrating an electric motor thatis a first embodiment of the invention;

FIG. 2 is an enlarged view illustrating a portion indicated by adot-dash line α in FIG. 1;

FIG. 3A is a perspective view illustrating a boss 2 and an output shaft3 of a comparative example so as to explain the first embodiment. FIG.3B is a top view illustrating the output shaft 3 shown in FIG. 3A;

FIG. 4 is a perspective view illustrating members used for shaft seal;

FIG. 5 is an axially sectional view illustrating an electric motor thatis a second embodiment of the invention;

FIG. 6A is a perspective view illustrating a boss 2 and an output shaft3 of the third embodiment. FIG. 6B is a top view illustrating the outputshaft 3 shown in FIG. 6A;

FIG. 7 is a perspective view illustrating the shape of a plate 9provided with slip-off preventing parts;

FIG. 8 is an explanatory view illustrating a rotor, an output shaft, anda plate shown in FIG. 1;

FIG. 9 is an explanatory view illustrating a rotor, an output shaft, anda plate;

FIG. 10 is aside view illustrating a motor terminal portion of a sixthembodiment of the invention;

FIG. 11 is a view illustrating a comparative example so as to explain acoil wire fixing portion;

FIG. 12 is a top view illustrating the motor terminal portion;

FIG. 13 is a perspective view illustrating the motor terminal portion;

FIG. 14 is an explanatory view illustrating a shape of a surface of ahook portion;

FIG. 15 is an explanatory view illustrating another shape of the surfaceof the hook portion.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment

Hereinafter, a first embodiment of the invention is described.

FIG. 1 is an axially sectional view illustrating a DC (direct current)electric motor according to the first embodiment of the invention.

In the motor shown in this figure, a rotor 1 uses a PPS resin. Athreaded hole portion 1 a is provided in a central shaft portionthereof. A rotation-stop sliding portion 2 a (a regulating portion) isformed into a shape having a flat face.

Reference numeral 3 designates an output shaft. Reference numeral 3 adenotes an output shaft sliding portion. Reference numeral 3 bdesignates a screw disposed at the side opposite to the output end ofthe output shaft 3. This screw 3 b meshes with and is inserted into thethreaded hole portion 1 a provided in the rotor 1. The output shaftsliding portion 3 a provided in the output shaft 3 penetrates throughthe rotation-stop sliding portion 2 a provided in the boss 2 and isformed into a shape having a flat face engaging with the rotation-stopsliding portion 2 a.

When the rotor 1 is rotate-driven, torque thereof is transmitted to theoutput shaft 3 through the threaded hole portion 1 a and the screw 3 b.However, the engagement between the output sliding portion 3 a and therotation-stop sliding portion 2 a prevents rotation of the output shaft3. Thus, the torque of the rotor 1 is converted to an axial linearmotion force owing to the presence of the screw portion 3 b and therotation-stop sliding portion 2 a, which engage with each other in therotor 1. That is, the screw portion 3 b and the rotation-stop slidingportion 2 a constitute a rotational-to-linear motion conversionmechanism.

FIG. 3A is a perspective view illustrating a boss 2 and an output shaft3 of a comparative example so as to explain the first embodiment. FIG.3B is a top view illustrating the output shaft 3 shown in FIG. 3A. Asshown in FIGS. 3A and 3B, usually, the screw portion 3 b is larger thanthe output shaft sliding portion 3 a. Thus, a hole 2 b, which is largerthan the output shaft sliding portion 3 a, is opened to the boss 2 so asto pass the screw portion 3 b, which is provided in the output shaft 3,through the boss 2 when the output shaft 3 is assembled to the motor.

As shown in FIG. 1, in this embodiment, the hole 2 b is covered with aseal 4 so as to block up the hole 2 b. Then, the seal 4 is held by aplate 5, which is fixed to the boss 2 by being press-fitted thereto.

FIG. 2 is an enlarged view illustrating a portion indicated by adot-dash line α in FIG. 1. FIG. 4 is a perspective view illustratingmembers used for shaft seal.

The hole 2 b, which is larger than the output shaft sliding portion, isformed in the boss 2 and covered with a deformable (or flexible) sealportion 4 a of the seal 4. At that time, the positioning of the seal 4is performed by fitting and assembling convex portions 2 c of the boss 2to a positioning portion 4 b of the seal 4. Then, the positioningportion 4 b is covered with the plate 5. A claw portion 5 a ispress-fitted into a plate holding hole 2 d of the boss 2, so that theplate 5 is fixed thereto. At that time, the dimensions of the seal 4 aare set so that the seal 4 a does not slide together with the slidingportion 3 a of the output shaft 3. Thus, similarly to a case that theseal 2 is not attached thereto, no sliding resistance is provided to thesliding portion 3 a. Incidentally, as a result of blocking up the hole 2b with the seal portion 4 a formed of a deformable material, such asrubber, when the screw 3 b is inserted, the screw 3 b can be inserted insuch a way as to push the seal portion 4 a aside. Thus, the insertion ofthe screw 3 b can easily be performed. The process of assembling theoutput shaft 3 to the rotor can easily be performed without beingchanged. Incidentally, during a normal operation other that theassembling of the output shaft 3 thereto, the screw 3 b does not passthrough the seal 4. Consequently, the screw 3 b does not affect anoperation of the motor.

Second Embodiment

FIG. 5 is an axially sectional view illustrating an electric motor thatis a second embodiment of the invention.

As shown in FIG. 5, a spring holder 6 attached to an output shaft 3 isshaped in such a manner as to be slightly smaller in inside diameterthan a counterpart housing 7. Thus, airtightness can be ensured. Inshort, it is sufficient to provide an extension portion 6 c in such amanner as to be extended outwardly from a portion 6 b of the springholder 6, which holds a spring. It is preferable for preventing theingress of foreign substances that the gap between the extension portion6 c and the housing 7 is set to be as small as possible. Incidentally, abreathing hole 6 a may be provided in a plate 6 in a case where the sizeof the hole 6 a is set in consideration of airtightness. The provisionof the breathing hole 6 a therein results in the fact that obstructionto upward-downward motions of the plate 6 due to the difference inpressure between the top and the bottom of the plate 6 becomes hard tooccur.

Third Embodiment

FIG. 6A is a perspective view illustrating a boss 2 and an output shaft3 of the third embodiment. FIG. 6B is a top view illustrating the outputshaft 3 shown in FIG. 6A.

As shown in FIGS. 6A and 6B, a screw portion 3 b is formed in such a wayas to be larger than an output shaft sliding portion 3 a. Thiseliminates the necessity for a hole 2 b dug for passing the screwportion 3 b, which is provided in the output shaft 3, through the boss2. Thus, the output shaft sliding portion 3 a can slide a rotation-stopsliding portion 2 a in a state in which airtightness is ensured.

The first to third embodiments have the following features.

A component for blocking up a gap opened so as to pass the screwportion, which is provided in the output shaft, at the assembling of theoutput shaft, which performs a linear motion, to the motor is attachedto the motor. Thus, foreign substances, moisture, gases and so forth canbe prevented from entering the inside of the motor. Consequently, thereliability of the motor is enhanced. Also, the dimensions of thecomponent for blocking up the gap are set so that the component does notslide together with the output shaft. Thus, the motor can ensureperformance, which is equal to that in a case in which the motor is notprovided with the component for blocking up the gap.

Also, a rubber material is used as the material of the component forblocking up the gap. Consequently, when the output shaft is assembled tothe motor, the rubber can be pushed aside by the output shaft screwportion. Thus, workability is enhanced by postponing the process ofassembling the output shaft to the motor.

Also, the plate attached to the output shaft is shaped in such a manneras to be slightly smaller than a counterpart actuator. Thus, foreignmatters, moisture, gasses and so on can be prevented from being enteringthe motor from the actuator.

Also, the sliding portion of the output shaft is formed in such a way asto be larger than the output shaft screw portion. Thus, a gap to beopened for passing the screw provided in the output shaft is not formed.Consequently, foreign substances, moisture, gasses and so on can beprevented from being entering the inside of the motor.

Fourth Embodiment

A fourth embodiment of the invention is further described by using FIG.1.

Reference numeral 8 designates a permanent magnet. Reference numeral 9denotes a plate. Reference numeral 10 designates each of bearingsrespectively provided on the top and the bottom of the rotor 1.Permanent magnets 8 divided into plural pole-pairs are disposed on theouter peripheral surface of the rotor 1. The bearings 10 are inserted toboth end sides of a set of the permanent magnets 8. The rotor 1 uses aPPS resin. A threaded hole portion 1 a is provided in a central shaftportion thereof. The permanent magnets 8, each of which is constitutedby a ferrite magnet, and a plate 9, which serves as a stopper for therotor 1, are integrally insert-formed on the outer peripheral surface ofthe rotor 1.

A commutator 5 is inserted and assembled to one of side surfaces of therotor 1. One of the commutator 5 and the rotor 1 is partly or entirelyplastic-deformed or heat-deformed (in this embodiment, at a caulkingportion 1 b) to thereby fix both of the commutator 5 and the rotor 1.

Reference numeral 15 designates a stator. Reference numeral 11 denotes acore. Reference numeral 12 designates a coil. Reference numeral 13denotes a housing. Reference numeral 14 designates a motor terminal. Thestator 15 is constituted by winding a three-phase coil around the core11. The core 11 is disposed so that stator-side magnetic poles areformed outside the permanent magnets 8 of the rotor 1 by providing apredetermined gap therebetween. The housing 13 holds and fixes thestator 15. Also, the housing 13 encloses and supports the rotor 1 at acentral portion thereof through the bearing 10.

Reference numeral 2 designates a boss. Reference character 2 a denotes arotation-stop sliding portion. Reference numeral 21 designates a preloadspring. The boss 2 is assembled to one of sides of the housing 13. Thepreload spring 21 is disposed between the boss 2 and the bearing 10 thatmovably supports the rotor 1, and prevents axial displacement andwobbling of the rotor 1 by applying a predetermined pushing force to therotor 1. The rotation-stop sliding portion 2 a provided in the boss 2 isformed in such a way as to have a shape including a flat face. The boss2 is assembled to and seals the housing 13, which accommodates thestator 15, in such a manner as to be able to maintain airtightness. Theboss 2 is fixed thereto by screwing, heat-caulking or the like.

Reference numeral 3 designates an output shaft. Reference character 3 adenotes an output shaft sliding portion. Reference character 3 bdesignates a screw portion. Reference character 3 c denotes an outputshaft stopper. The screw portion 3 b disposed at a counter-output side(that is, at a side opposite to a direction in which the output shaft 3projects) of the output shaft 3 is inserted into the threaded holeportion 1 a, which is provided in the rotor 1, in such a way as to meshtherewith. The output shaft sliding portion 3 a provided in the outputshaft 3 penetrates through the rotation-stop sliding portion 2 aprovided in the boss 2, and is shaped in such a way as to have a flatface that abuts against the rotation-stop sliding portion 2 a.

Reference numeral 40 designates a position sensor formed in such a wayas to be integral with a motor external terminal 43. Reference numeral41 denotes a brush connected to the motor external terminal 43.Reference numeral 42 designates a brush connected to the motor terminal14. The motor external terminal 43, which is formed in such a manner asto be integral with the position sensor 40, and the brush 41 areelectrically connected to each other. The motor terminal 14 and thebrush 42 are electrically connected to each other. The brushes 41 and 42are electrically connected to the commutator 5 and form connectionpatterns, which are needed for driving the motor, on the commutator 5.

Therefore, energization is mechanically switched by the commutator 5 tothe coil 12 thereby to rotation-drive the rotor 1. Torque of the rotor 1is transmitted to the output shaft 3. Incidentally, rotation of theoutput shaft 3 is hindered by abutment between the output slidingportion 3 a and the rotation-stop sliding portion 2 a. Thus, the torqueof the rotor 1 is converted to an axial linear motion force by the screwportion 3 b and the rotation-stop sliding portion 2 a, which engage witheach other in the rotor 1.

The output shaft 3 is driven in this manner. When the output shaft 3 isretracted, the output shaft stopper 3 c abuts against the stopper 9 ofthe rotor 1. Thus, the rotor can resist collision impact.

FIG. 7 is a perspective view illustrating the shape of the plate 9provided with slip-off preventing parts.

The rotor 1 is formed of a PPS resin and holds the plate 9 byinsert-forming using the resin. Thus, the plate 9 is shaped, asillustrated in FIG. 7, so that the resin engages with a claw 3 a, andthat a holding strength in a slip-off direction is enhanced.Incidentally, in this embodiment, a leading end portion of the claw 3 ais laterally projected. However, as long as the resin engages with theplate, each of the claws 3 a may take any shape. The holding strengthcan be enhanced by increasing an amount of the resin engaged with theplate.

FIG. 8 is an explanatory view illustrating the rotor, the output shaft,and the plate shown in FIG. 1.

As shown in FIG. 8, the plate 9, which is provided in the rotor 1 andserves as a stopper, is disposed in such a way as to abut against theoutput shaft in the direction in which a linear motion thereof isperformed. The plate 9 is shaped so that an abutting surface, on whichthe plate 9 abuts against the output shaft 3, is a flat face.

Fifth Embodiment

FIG. 9 is an explanatory view illustrating a rotor, an output shaft, anda plate. As shown in this figure, the plate 9, which is provided in therotor 1 and serves as a stopper, is disposed in such a way as to abutagainst the output shaft 3 in the direction of rotation. The plate 9 isshaped so that an abutting surface, on which the plate 9 abuts againstthe output shaft 3, is a flat face.

The plate 9 is attached to an end surface 1 d in a rotating direction ofthe stopper 1 c, which is provided in the rotor 1 and shaped in such away as to form a slope like a semi-circular ring, by insert-molding orthe like.

As the rotor 1 rotates, the plate 9 rotates and abuts against the outputshaft stopper 3 c of the output shaft 1 thereby to stop the output shaft1.

Incidentally, in a case where the number of threads of the screw of therotor differs from that of stopper surfaces, there are plural positions,at which the output shaft 1 may be stopped, in a structure shown in FIG.9. However, in the case of the structure shown in FIG. 8, for any numberof threads, there is only one position at which the output shaft may bestopped. Thus, an initial position (that is, a position at which theoutput shaft 1 is made to abut against the stopper) of the output shaft1 is uniquely determined. This facilitates initialization of theposition of the output shaft 1 to the initial position.

The forth and fifth embodiments of the invention have the followingfeatures.

When a rotor of a DC motor is manufactured by resin-molding, a metallicplate is insert-formed in the rotor as a stopper. Thus, endurance of therotor against the impact of a collision thereof with the output shaftcan be considerably enhanced.

Also, slip-off preventing parts are provided in the metallic plate. Thisstrikingly enhances a plate holding strength.

Consequently, the invention can prevent the resin from being damaged andsticking by the collision thereof with the output shaft.

Also, the stopper is disposed in the direction of a linear motioninstead of being disposed in the direction of rotation. Moreover, thestopper is shaped in such a way as to have a flat face. Thus, for anynumber of threads of the screw portion of the output shaft, theposition, at which the output shaft is assembled, is uniquelydetermined. Thus, there is no necessity for replacing the output shaft,so that the workability is enhanced.

For example, in the case of the related art, in which the stopper of therotor is disposed in the direction of rotation thereof and where thenumber of stopper surfaces differs from that of threads of the screwportion, there may be different positions, at which the output shaft isassembled thereto. Thus, the related motor needs reassembling of theoutput shaft thereto or equipment of an output shaft.

Sixth Embodiment

FIG. 10 is a side view illustrating a motor terminal portion of thissixth embodiment of the invention. FIG. 11 is a view illustrating acomparative example so as to explain a coil wire fixing portion. FIG. 12is a top view illustrating the motor terminal portion. FIG. 13 is aperspective view illustrating the motor terminal portion. FIGS. 14 and15 are explanatory views illustrating shapes of a surface of a hookportion.

In these figures, reference numeral 14 designates a motor terminal.Reference numeral 51 denotes a coil wire. Reference numeral 11designates a bobbin. The motor terminal 14 is press-fitted into a holeformed in the bobbin 11 (alternatively, insert-formed when the bobbin 11is mold-formed) and fixed thereto.

As shown in FIG. 10, a stopper 52 a for preventing displacement of acoil is provided in a coil wire fixing portion 52 of the motor terminal14. The stopper 52 a is adapted in such a manner as not to be displacedto the side of a fusing portion 52 c and affect fusing after the coilwire 51 is engaged with a hook portion 52 b. Incidentally, the stoppers52 a are provided on both sides of the hook portion 52 a, which isformed into a concave shape.

Incidentally, after the coil wire 51 is hooked on the hook portion 52 b,the coil wire fixing portion 52 is bent. Thus, the coil wire 51 iscaught in the coil wire fixing portion 52. Then, fusing (resistancewelding or the like) is performed on the fusing portion 52 c.Consequently, the coil wire 51 is physically and electrically connectedto the coil wire fixing portion 52.

When the coil wires 51 are wound around the motor terminal hook portion52 b, the two coil wires 51 may be caught therein in an overlaid manner(thus, the hook portion 52 b is bend as indicated by dashed lines β inFIG. 11). This may affect fusing in the subsequent process (that is, afusing failure may occur, and there is possibility of occurrence of acontact failure of the coil wires 51). Thus, as illustrated in FIG. 12,an initial bending width of the coil wire fixing portion 52 is set to beless than the thickness of the coil wire 51. Consequently, the coil wirefixing portion is set so that the two coil wires 51 are not overlaid.

As illustrated in FIG. 13, a tapered shape 52 d is formed so that anozzle of an automatic winding machine for introducing (or engaging) thecoil wire 51 is easily moved when the coil wire 51 is engaged with themotor terminal 14.

When the coil wire 51 is wound around the hook portion 52 b of the motorterminal 14 as shown in FIG. 13, preferably, the tapered shape 52 d isformed by performing R-chamfering (Rounded-shape chamfering) 52 e asshown in FIG. 5 for preventing the coil from being flawed. This isimplemented by performing press working through the use of a jig havingan R-surface.

Although the press working may be performed on this hook portion 52 d bya planar jig as shown in FIG. 14, a material is moved by the pressworking at that time. Thus, this method has problems that a burr 52 f isformed, and that the coil wire 51 is flawed. Therefore, a method ofperforming R-chamfering 52 e, as illustrated in FIG. 15, is preferable.

This sixth embodiment also has the following features.

A stopper portion is provided so as to prevent displacement of the coilwire and ingress thereof into the fusing portion when the coil wire isconnected to the motor terminal hook portion by performing fusingthereon after the coil wire is engaged with the hook portion (that is,after coil terminal processing). Thus, the connection therebetween isachieved by performing stable fusing without displacement of the coilwire and ingress thereof into the fusing portion. Consequently, a coilwire can be prevented from being displaced and causing a fusing failure.

When the coil terminal processing is performed on the coil wire at themotor terminal, a corner part of the fusing portion is formed into thetapered shape so as to facilitate the movement of the nozzle forintroducing the coil wire. Thus, stable coil terminal processing isachieved. Also, a coil-terminal-processing time can be reduced. When thecoil wire is wound around the hook portion as the coil terminalprocessing, a time taken to move the nozzle for introducing the coilwire can be decreased. Also, the nozzle can be prevented from being intocontact with the hook portion and causing a failure of the terminalprocessing.

In a case where two coil wires are caught in a motor terminal hookportion when the coil wires are wound therearound, a fusing failure isliable to occur in the subsequent process. Thus, in consideration of awire diameter of a coil wire, the hook portion is formed into a shape,which contains only one coil wire. Consequently, stable coil terminalprocessing is achieved. Also, when the coil wire is wound around thehook portion as the coil terminal processing, two coil wires areprevented from being caught therein in an overlaid manner and affectingthe fusing.

The corner part of the motor terminal hook portion is chamfered so as toprevent the coil wire from being flawed when a coil wire is wound aroundthe motor terminal hook portion. However, the motor terminal ismanufactured in a press working process, so that the chamfering isperformed thereon usually by pressing a chamfering face thereagainstthrough the use of a die. Then, the pressed material is displaced, sothat a burr is produced. The R-chamfering is performed thereon so as torestrain a burr from being produced. Thus, a burr is restrained frombeing produced when a motor terminal is manufactured. Consequently,quality and workability can be enhanced. Also, a burr can be preventedfrom being produced and affecting the quality and the workability.

The motor according to the invention has the seal member provided at aportion, through which the screw portion placed in the sliding hole canpass and in which the sliding portion does not slide. Thus, foreignsubstances or the like can be prevented from entering the motor from thesliding hole.

Also, the sliding portion is larger in cross-section than the screwportion. Thus, foreign substances or the like can be prevented fromentering the motor from the sliding hole.

Also, the extension portion extended from the support portion of theplate, which supports the pushing member, toward the direction of theinner surface of the accommodating member is provided in the plate.Thus, foreign substances or the like can be prevented from entering themotor through the surrounding areas of the plate.

Also, the motor according to the invention has the metallic stopper,which is provided in the rotor and which abuts against the output shaftand axially regulates the output shaft. Thus, even when the rotor isbroken and such a broken part becomes a foreign matter, the foreignmatter can be prevented from entering the motor.

Also, the concave hook portion, around which the coil wires are wounded,is provided in the terminal of the motor according to the invention.Thus, the coil wires can be prevented from being flawed when caulked tothe terminal.

1. A motor comprising: a stator provided with a coil to be supplied withelectric current; a resin rotor adapted to rotate in said stator andprovided with a magnet; an output shaft having a screw portion to bescrewed into a threaded hole provided in said rotor; a regulatingportion for axially moving said output shaft by regulating rotation ofsaid output shaft and for sliding and holding said output shaft; asliding portion, provided in said output shaft and adapted to slide in asliding hole provided in said regulating portion; and a metallicstopper, provided in said rotor and adapted to abut against said outputshaft, for axially regulating said output shaft.
 2. The motor accordingto claim 1, wherein said stopper axially abuts against said outputshaft.
 3. The motor according to claim 1, wherein said stopper isinsert-molded into and fixed to said rotor.